Across
1
Corner point of a polygon
2
Sum divided by count
4
The number representing nothing
5
Line crossing from corner to corner
6
Middle value in an ordered dataset
11
Mathematical rule or equation
12
Rectangle with four equal sides
Down
1
Symbol representing unknown value
2
Reference line in a graph
3
Number divisible only by 1 and itself
7
Line touching circle at one point
8
Parts per hundred
9
Difference between highest and lowest values
10
Three-sided polygon
13
Line segment connecting two circle points